Topic
Supercontinuum
About: Supercontinuum is a research topic. Over the lifetime, 7071 publications have been published within this topic receiving 127671 citations.
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TL;DR: The generation of an octave-spanning supercontinuum inside a short piece of a highly nonlinear fiber inside a stretched pulse amplifier and self-referencing detection of the carrier-envelope phase evolution with an f-to-2f interferometer is demonstrated.
Abstract: We present an improved design of an amplified Er:fiber laser system for the generation of intense femtosecond pulses. By properly controlling the influence of optical nonlinearities inside a stretched pulse amplifier, the spectrum is broadened to over 100 nm. The pulses are recompressed to 65 fs. A linearly polarized output of 110 mW is obtained at 67 MHz repetition rate. As a first application, we report the generation of an octave-spanning supercontinuum inside a short piece of a highly nonlinear fiber. Self-referencing detection of the carrier-envelope phase evolution with an f-to-2f interferometer is demonstrated.
191 citations
TL;DR: The generation of a supercontinuum is demonstrated by pumping the wire with mid-infrared picosecond pulses in the anomalous dispersion regime by extracting the group velocity dispersion and fourth-order dispersion coefficient of the silicon wire waveguide.
Abstract: We demonstrate the generation of a supercontinuum in a 2 cm long silicon wire by pumping the wire with mid-infrared picosecond pulses in the anomalous dispersion regime. The supercontinuum extends from 1535 nm up to 2525 nm for a coupled peak power of 12.7 W. It is shown that the supercontinuum originates primarily from the amplification of background noise. A detailed analysis of the spectral components which are generated through phase-matched processes is applied to extract the group velocity dispersion and fourth-order dispersion coefficient of the silicon wire waveguide.
190 citations
TL;DR: This work investigates the effect of the fiber geometry on the spectral resolution and bandwidth, and discusses the additional limitation on the bandwidth imposed by speckle contrast reduction when measuring dense spectra.
Abstract: A standard multimode optical fiber can be used as a general purpose spectrometer after calibrating the wavelength dependent speckle patterns produced by interference between the guided modes of the fiber. A transmission matrix was used to store the calibration data and a robust algorithm was developed to reconstruct an arbitrary input spectrum in the presence of experimental noise. We demonstrate that a 20 meter long fiber can resolve two laser lines separated by only 8 pm. At the other extreme, we show that a 2 centimeter long fiber can measure a broadband continuous spectrum generated from a supercontinuum source. We investigate the effect of the fiber geometry on the spectral resolution and bandwidth, and also discuss the additional limitation on the bandwidth imposed by speckle contrast reduction when measuring dense spectra. Finally, we demonstrate a method to reduce the spectrum reconstruction error and increase the bandwidth by separately imaging the speckle patterns of orthogonal polarizations. The multimode fiber spectrometer is compact, lightweight, low cost, and provides high resolution with low loss.
187 citations
TL;DR: In this article, a method for generating multiwavelength-channel picosecond optical pulses from a single laser source using supercontinuum in optical fibres combined with an all-fibre birefringent periodic filter is proposed.
Abstract: A novel method for generating multiwavelength-channel picosecond optical pulses from a single laser source is proposed using supercontinuum in optical fibres combined with an all-fibre birefringent periodic filter. More than 100-wavelength-channel, 10 ps optical pulses are generated simultaneously over a 1.224–1.394 μm spectral range with a 1.9 nm spacing using a 7.6 ps Nd : YLF laser pulse source.
186 citations
TL;DR: Self-phase-stabilized near-IR pulses have been generated by difference-frequency generation of a filament broadened supercontinuum followed by two-stage optical parametric amplification, suited as a driver for high-order harmonic generation and isolated attosecond pulse production.
Abstract: Ultrabroadband self-phase-stabilized near-IR pulses have been generated by difference-frequency generation of a filament broadened supercontinuum followed by two-stage optical parametric amplification. Pulses with energy up to 1.2 mJ and duration down to 17 fs are demonstrated. These characteristics make such a source suited as a driver for high-order harmonic generation and isolated attosecond pulse production.
185 citations